Carrageenan is found in the cell walls of which group of algae?


a. red algae
b. green algae
c. dinoflagellates
d. yellow-green algae

Verified step by step guidance

1. Understand that carrageenan is a substance extracted from certain types of algae.
2. Recognize that carrageenan is commonly used in the food industry as a thickener and stabilizer.
3. Recall that carrageenan is specifically found in the cell walls of a particular group of algae.
4. Identify the group of algae known for containing carrageenan in their cell walls.
5. Conclude that the correct group of algae is red algae, which is known for having carrageenan in their cell walls.

Key Concepts

Carrageenan

Carrageenan is a polysaccharide extracted from red algae, primarily used as a thickening and stabilizing agent in food products. It is derived from the cell walls of certain species of red algae, such as Chondrus crispus, and is known for its ability to form gels and emulsions, making it valuable in the food industry.

Red Algae

Red algae, or Rhodophyta, are a diverse group of marine algae characterized by their red pigment, phycoerythrin, which allows them to absorb blue and green light. They are primarily found in warmer waters and play significant roles in marine ecosystems, including providing habitat and food for various marine organisms.

Algal Classification

Algae are classified into different groups based on their pigmentation, structure, and reproductive methods. The main groups include green algae (Chlorophyta), red algae (Rhodophyta), and brown algae (Phaeophyta), among others. Understanding these classifications helps in identifying the specific characteristics and uses of each group, including the presence of compounds like carrageenan.